#!/usr/bin/env python """ Converter.py A simple application that provides unit conversions """ ID_ABOUT_MENU = 200 ID_EXIT_MENU = 201 from wxPython.wx import * class ConverterPanel(wxPanel): from wxPython.wx import * def __init__(self, parent, id, Unit, Data_dict): self.ID_FROM_BOX = 100 self.ID_TO_BOX = 101 self.ID_FROM_UNITS = 102 self.ID_TO_UNITS = 103 self.Unit = Unit self.Data_dict = Data_dict self.Units = Data_dict.keys() ##self.Units.sort() wxPanel.__init__(self, parent, id, wxDefaultPosition) FromBox = wxBoxSizer(wxHORIZONTAL) FromBox.Add(20, 1, 1) self.InputBox = wxTextCtrl(self, self.ID_FROM_BOX, "", wxDefaultPosition,wxDefaultSize) FromBox.Add(self.InputBox, 0, wxALIGN_LEFT) FromBox.Add(20, 1, 1) self.FromUnits = wxChoice(self, self.ID_FROM_UNITS, wxDefaultPosition,wxDefaultSize,self.Units) FromBox.Add(self.FromUnits,0, wxALIGN_RIGHT) FromBox.Add(20, 1, 1) ToBox = wxBoxSizer(wxHORIZONTAL) ToBox.Add(20, 1, 1) self.OutBox = wxTextCtrl(self, self.ID_TO_BOX, "", wxDefaultPosition, wxDefaultSize,style = wxTE_READONLY) ToBox.Add(self.OutBox, 0, wxALIGN_LEFT) ToBox.Add(20, 1, 1) self.ToUnits = wxChoice(self, self.ID_TO_UNITS, wxDefaultPosition,wxDefaultSize,self.Units) ToBox.Add(self.ToUnits,0, wxALIGN_RIGHT) ToBox.Add(20, 1, 1) OuterBox = wxBoxSizer(wxVERTICAL) OuterBox.Add(0,0, 4) OuterBox.Add(wxStaticText(self, -1, "Convert from:", wxDefaultPosition, wxDefaultSize),0,wxALIGN_CENTER) OuterBox.Add(0,10, 0) OuterBox.Add(FromBox,0,wxALIGN_CENTER) OuterBox.Add(0,0, 2) OuterBox.Add(wxStaticText(self, -1, "To:", wxDefaultPosition, wxDefaultSize),0,wxALIGN_CENTER) OuterBox.Add(0,10, 0) OuterBox.Add(ToBox,0,wxALIGN_CENTER) OuterBox.Add(0,0, 8) self.SetAutoLayout(true) self.SetSizer(OuterBox) EVT_TEXT(self, self.ID_FROM_BOX, self.Recalculate) EVT_CHOICE(self,self.ID_TO_UNITS , self.Recalculate) EVT_CHOICE(self,self.ID_FROM_UNITS , self.Recalculate) def Recalculate(self,event): try: from_string = self.InputBox.GetValue() # this is not quite really sigfigs, as all zeros are counted, but it looks better # iiit is set to a minimum of 4 figures sigfigs = max(len(from_string.split("e")[0].replace(".","")),3) sigfigs = min(sigfigs,7) # there are no more than 7 digits in the conversion factors from_val = float(self.InputBox.GetValue()) from_unit = self.FromUnits.GetStringSelection() to_unit = self.ToUnits.GetStringSelection() if self.Unit == "Temperature": # Special Case A1 = self.Data_dict[from_unit][0] B1 = self.Data_dict[from_unit][1] A2 = self.Data_dict[to_unit][0] B2 = self.Data_dict[to_unit][1] #to_val = (round((from_val * A1 + B1),13) - round(B2,13))*A2 # rounding to get rid of cancelation error to_val = ((from_val + B1)*A1/A2)-B2 sigfigs += 2 # temp adds and subtracts, so it looks better to have a couple of extra digits. else: if from_unit == "API": # another Special case (could I do this the same as temp?) from_val = 141.5/(from_val + 131.5) from_unit = "Specific Gravity" sigfigs += 2 # API is also wierd, so it looks better to have a couple of extra digits. if to_unit == "API": to_val = 141.5/(from_val * self.Data_dict[from_unit]) - 131.5 sigfigs += 2 # API is also wierd, so it looks better to have a couple of extra digits. else: to_val = from_val * self.Data_dict[from_unit] / self.Data_dict[to_unit] format_string = "%%.%ig"%sigfigs self.OutBox.SetValue(format_string%(to_val,))# this displays only 6 sigfigs... except ValueError: self.OutBox.SetValue("") class ConverterNB(wxNotebook): def __init__(self, parent, id): wxNotebook.__init__(self, parent, id,style=wxNB_LEFT ) for (unit,data) in ConvertDataUnits.items(): win = ConverterPanel(self, -1,unit,data) self.AddPage(win, unit) # EVT_NOTEBOOK_PAGE_CHANGED(self, self.GetId(), self.OnPageChanged) ## def OnPageChanged(self, event): ## print 'OnPageChanged' ## event.Skip() class ConverterFrame(wxFrame): def __init__(self,parent, id,title,position,size): wxFrame.__init__(self,parent, id,title,position, size) ## Set up the MenuBar MenuBar = wxMenuBar() file_menu = wxMenu() file_menu.Append(ID_EXIT_MENU, "E&xit","Terminate the program") EVT_MENU(self, ID_EXIT_MENU,self.OnQuit) MenuBar.Append(file_menu, "&File") help_menu = wxMenu() help_menu.Append(ID_ABOUT_MENU, "&About", "More information About this program") EVT_MENU(self, ID_ABOUT_MENU, self.OnAbout) MenuBar.Append(help_menu, "&Help") self.SetMenuBar(MenuBar) EVT_CLOSE(self, self.OnCloseWindow) # Add the Notebook self.stuff = ConverterNB(self,-1) self.Show(true) def OnAbout(self, event): dlg = wxMessageDialog(self, "This is a small program that \n" "Provides some handy conversions", "About Me", wxOK | wxICON_INFORMATION) dlg.ShowModal() dlg.Destroy() def OnQuit(self,event): self.Close(true) def OnCloseWindow(self, event): self.Destroy() class App(wxApp): def OnInit(self): frame = ConverterFrame(NULL, -1, "Unit Converter", wxDefaultPosition, (420,340)) self.SetTopWindow(frame) return true ##This is the data stored and used by my conversion calculator ##Every Unit is stored in terms of SI units so that we can convert back ##and forth between anything through SI units ConvertDataUnits = { # All lengths in terms of meters "Length" : {"Meters" : 1.0, "Centimeters" : 0.01, "Millimeters" : 0.001, "Kilometers" : 1000.0, "Feet" : 0.3048, "Inches" : 0.0254, "Yards" : 0.9144, "Miles" : 1609.344, "Nautical Miles": 1852.0, "Fathoms" : 1.8288, "Latitude Degrees": 111120.0, "Latitude Minutes": 1852.0 }, # All Areas in terms of square meters "Area" : {"Square Meters" : 1.0, "Square Kilometers" : 1e6, "Acres" : 4046.8564, "Square Miles" : 2589988.1, "Square Yards" : 0.83612736, "Hectares" : 10000.0 }, # All volumes in terms of cubic meters "Volume" : {"Cubic Meters" : 1.0, "Cubic Centimeters" : 1e-6, "Barrels" : .1589873, "Liters" : 1e-3, "Gallons" : 0.0037854118, "Cubic Feet" : 0.028316847 }, # All Temperature units in K (multiply by, add) "Temperature" : {"Kelvin" : (1.0, 0.0), "Centigrade" : (1.0, 273.16), "Farenheight" : (0.55555555555555558, (273.16*9/5 - 32) ) }, # All Mass units in Kg (weight is taken to be mass at standard g) "Mass" : {"Kilograms" : 1.0, "Pounds" : 0.45359237, "Grams" : 1000 }, # All Time In Seconds "Time" : {"Seconds" : 1.0, "Minutes" : 60.0, "Hours" : 3600.0, "Days" : 86400.0 }, # All Velocities in meters per second "Velocity" : {"Meters per Second" : 1.0, "Centimeters per Second" : .01, "Kilometers per Hour" : 0.277777, "Knots" : 0.514444, "Miles per Hour" : 0.44704, "Feet per Second" : 0.3048 }, # All Discharges in cubic meters per second "Discharge" : {"Cubic Meters per Second" : 1.0, "Cubic Feet per Second" : .02831685, "Gallons per Hour" : 1.0515032833333335e-06, "Galons per Minute": 6.3090197000000006e-05, "Gallons per Second" : 0.0037854118 }, # All Oil Thicknesses in meters "Oil Thickness" : {"Meters" : 1.0, "Millimeters" : 0.001, "Barrels per Acre" : 3.92866176324e-05, "Barrels per Square Meter" : .1589873, "Liters per Square Kilometer" : 1e-9 }, ### Density in g/cc "Density" : {"Specific Gravity" : 1.0, "Grams per Cubic Centimeter" : 1.0, "API" : 0} } if __name__ == "__main__": app = App(0) app.MainLoop()